Sorry to hear your problems, but it doesn't mean they're all bad. Asustek makes great quality products; so it's not fair to discount the entire company or product line because the three you had may or may not have been problematic.
You said the plastic wasn't lined up on the first one... come on. Plastic is plastic, and people who whine about something like a misaligned piece give Mac users a bad name. You probably could had fixed it yourself by putting a little pressure on the spot. Returning for issues like this make it harder for people with real problems to get any recognition because AppleCare thinks they have a bunch of hardware-hypochondriacs for end-users.
You said the plastic wasn't lined up on the first one... come on. Plastic is plastic, and people who whine about something like a misaligned piece give Mac users a bad name. You probably could had fixed it yourself by putting a little pressure on the spot. Returning for issues like this make it harder for people with real problems to get any recognition because AppleCare thinks they have a bunch of hardware-hypochondriacs for end-users.